Connected: An Internet Encyclopedia
RFC 1771 - 6.7 Control over version negotiation

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### 6.7 Control over version negotiation

Since BGP-4 is capable of carrying aggregated routes which cannot be properly represented in BGP-3, an implementation which supports BGP-4 and another BGP version should provide the capability to only speak BGP-4 on a per-peer basis.

Next: 6.8 Complex AS_PATH aggregation

Connected: An Internet Encyclopedia
RFC 1771 - 6.7 Control over version negotiation